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R. ALBRECHT.

WOOD PAVEMENT.

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ROBERT ALBREQHT, OF IlLSllv PRUSSIA, GERMNY.

woon PAVEMENT.

SPECIFICATION forming part of Letters Application iil'ed February l,1884. (No model.)

, To all whomjt may concern:

Beit known that I, ROBERT ALBRECHT, a subject of the King of Prussia,Germany, residing at the city of Tilsit, in the Kingdom of Prussia,Germany, have invented certain new and useful Improvements in WoodPavements, (which has been patented heretofore by the government ofGreat Britain under date of December 3, 1883, No. 5, 621,) of which thefollowing is a specification.

Wooden pavements were heretofore made by placing the wooden blocks inparallel rows and filling the joints or interstices with liquid cement,tar, and sand. This construc- 1 5 tion, however, does not insure a firmand solid connection of the blocks, and in fact possesses so littledurability and strength that a foundation or bed of beton or concrete isan absolute necessity, and hence wooden pavements laid and supported inthis manner are quite expensive.4

In order to-furnish a cheap wood pavement, the first requisite is todispense with the eX- pensive foundation of concrete; but inforder toallow this to be done it is also necessary to connect the individualwooden blocks with each other in such a manner that the pressure appliedto an individual block is not transmitted by it directly upon thefoundation,

" 3o but is distributed upon a series of adjoining blocks,and is dation.

, The "present .invention provides a wooden pavement in which theabove-mentioned theory is carried out; and it consists in the construction and combination of parts which will be hereinafter more fullydescribed, and then set forth in the claims. .Y

In the drawings, Figure l is a perspective by them transmitted to thefounl 4o view of a group of adjoining blocks secured together byinterlocking metal stripsor tongues. Fig. '2 ,is a plan or top view ofwooden paving-blocks supported on a foundation of unburned bricks. Fig.3 is a ver- 45 tical transverse section representing a foundationcomposed of unburned bricks and two outer courses of burned brick, andshowing a partial course of connected wooden blocks laid upon such foundation.V

` 5o Similar letters of reference vindicate corresponding parts.

Patent No. 295,610, dated March 25, 1884.

Patented in England December 3, 1853, No. 5,621.

The wooden blocks are provided at their` sides or longitudinal faceswith a narrow groove or cut, a, into which is inserted astrip, b, ofband-iron or other suitable metal, that serves to bind together theblocks of two adjoining courses or rows. The depth of the grooves orslits c has to be equal to half the width of the strips of metalemployed. The drawings show the groove a located at the middle of thelong side or surface of the block; but it may be also arranged somewhathigher or lower, as desired. By this method of connecting the blocks thedownward pressure brought to bear upon any single or individual block isdistributed upon the neighboring blocks in such a manner that theindividual blocks no longer require a foundation of stone or bton. uponan earth foundation properly rolled or stamped to present a smooth andsufficiently hard surface, and then bind the blocks together by thestrips in the manner described.

In place of the earth foundation, a foundation composed of unburnedbricks or blocks of dried clay set in clay mortar may be used, which isonly a little more expensivethan a foundation or bed of gravel, andwhich possesses all the strength of the latter.

In Figs. 2 and 3, D represents a foundation or bed formed of blocks ofunburned the foundation adjoining the curbstone C, made of two courses,B B, of burned brick Set in cement mortar, the object of which is tormly support the wooden blocks adjoining the curb, at which point, aswill be readily apparent, only half of the downward pressure brought tobear upon the curb-blocks is transmitted to the adjoining blocks.

It is to be observed that the 4wear of a wood pavement laid in themanner proposed by me is much less than when the blocks are laid in thecustomary way, this being mainly due to the existence of an elasticfoundation or bed, and the fact that the blocks are connected so as tobear the pressure and strain of travel over the same in uniform or equalmanner. Having thus described my invention, I claim as new and desiretosecure by Letters :Eat-

ent-' y 1. A pavement composed of a foundation or It is sufficient toplace the blocks clay; and V in the same figures I have shown a portionof bed of unburned brieks and of Wooden blocks laid upon said foundationand connected by interlocking metal strips inserted in side grooves ofthe blocks, substantially as described.

2. A pavementcoinposed of a foundation or bed composed of unburnedbrieks and an outer or Curb portion of burned bricks7 and of woodenblocks grooved in theirsides7 laid l

